Original 1st printing 19&7/8 x 26&1/4" commemorative silkscreen concert poster for a benefit for A.R.T. ("Artist's Rights Today"), held at the Gift Center in San Francisco, CA on 3/22/1989.

 Poster lists appearances by the Grateful Dead's Jerry Garcia, Country Joe McDonald, the Dinosaurs (featuring John Cipollina (Quicksilver), Peter Albin (Big Brother & the Holding Company), Barry "the Fish" Melton, Spencer Dryden (Jefferson Airplane), Merl Saunders, Pete Sears, Nick Gravenites, Roy Blumenfeld (Blues Project), M.C. Joe Sagara and more. 

 Art by Stanley Mouse (who also HAND-SIGNED the poster in pencil, along with the other members of "the Big 5", Alton Kelley (twice, one signature is on the reverse), Rick Griffin, Wes Wilson and Victor Moscoso), this one is numbered (by Moscoso) B-20/200 (not sure what Victor's "B" designation represents, but this is an artist's proof and is not part of the regular numbered edition).  

 Thick oak-tag stock hand-pulled silkscreen poster is in excellent (B+) condition; just a hint of surface wear (a couple of small soft spots above Griffin's and Kelley's signatures) and an extremely well camouflaged edge ding or two, otherwise fine. 

  An absolutely SUPERB-looking example of the last of the four "A.R.T." benefit silkscreens.